<template>
<!-- https://github.com/wangduanduan/element-audio/blob/master/src/App.vue -->
  <div class="di main-wrap" v-loading="audio.waiting">
    <!-- 这里设置了ref属性后，在vue组件中，就可以用this.$refs.audio来访问该dom元素 -->
    <audio ref="audio" class="dn"
    :src="theUrl" :preload="audio.preload"
    @play="onPlay"
    @error="onError"
    @waiting="onWaiting"
    @pause="onPause"
    @timeupdate="onTimeupdate"
    @loadedmetadata="onLoadedmetadata"
    ></audio>
    <div v-if="errorFile">未能找到录音文件</div>
    <div v-else>
      <div>
        <el-tag type="info">{{ audio.currentTime | formatSecond}}</el-tag>
        <el-slider v-show="!controlList.noProcess"
        v-model="sliderTime"
        :format-tooltip="formatProcessToolTip"
        @change="changeCurrentTime"
        @mouseup.native="mouseupChange"
        @mousedown.native="mousedownChange"
        class="slider"></el-slider>
        <el-tag type="info">{{ audio.maxTime | formatSecond }}</el-tag>
      </div>
      <el-button :type="audio.playing ? 'primary' : 'success'" @click="startPlayOrPause" size="mini">
        <i :class="audio.playing ? 'fa fa-pause' : 'fa fa-play'"></i>
      </el-button>
      <el-button v-show="!controlList.noSpeed" type="text" @click="changeSpeed">{{audio.speed | transSpeed}}</el-button>

      <el-button v-show="!controlList.noMuted"
                 :type="audio.muted ? 'danger' : 'success'"
                 @click="startMutedOrNot" size="mini">
        <i :class="audio.muted ? 'fa fa-volume-off' : 'fa fa-volume-up'"></i>
      </el-button>

      <el-slider v-show="!controlList.noVolume" v-model="volume" :format-tooltip="formatVolumeToolTip" @change="changeVolume" class="slider"></el-slider>

      <a :href="theUrl" v-show="!controlList.noDownload" target="_blank" class="download" download>
        <i class="fa fa-download"></i>
      </a>
    </div>
  </div>
</template>

<script>
function realFormatSecond(second) {
  var secondType = typeof second;
  if (secondType === "number" || secondType === "string") {
    second = parseInt(second);
    var hours = Math.floor(second / 3600);
    second = second - hours * 3600;
    var mimute = Math.floor(second / 60);
    second = second - mimute * 60;
    return (
      hours + ":" + ("0" + mimute).slice(-2) + ":" + ("0" + second).slice(-2)
    );
  } else {
    return "0:00:00";
  }
}
export default {
  props: {
    theUrl: {
      type: String,
      required: true
    },
    theSpeeds: {
      type: Array,
      default() {
        return [1, 1.5, 2];
      }
    },
    theControlList: {
      type: String,
      default: ""
    }
  },
  name: "VueAudio",
  data() {
    return {
      errorFile:false,
      url: this.theUrl || "http://devtest.qiniudn.com/secret base~.mp3",
      clickstatus: false,
      audio: {
        currentTime: 0,
        maxTime: 0,
        playing: false,
        muted: false,
        speed: 1,
        waiting: true,
        preload: "auto"
      },
      sliderTime: 0,
      volume: 100,
      speeds: this.theSpeeds,
      controlList: {
        // 不显示下载
        noDownload: false,
        // 不显示静音
        noMuted: false,
        // 不显示音量条
        noVolume: false,
        // 不显示进度条
        noProcess: false,
        // 只能播放一个
        onlyOnePlaying: false,
        // 不要快进按钮
        noSpeed: false
      }
    };
  },
  methods: {
    setControlList() {
      let controlList = this.theControlList.split(" ");
      controlList.forEach(item => {
        if (this.controlList[item] !== undefined) {
          this.controlList[item] = true;
        }
      });
    },
    changeSpeed() {
      let index = this.speeds.indexOf(this.audio.speed) + 1;
      this.audio.speed = this.speeds[index % this.speeds.length];
      this.$refs.audio.playbackRate = this.audio.speed;
    },
    startMutedOrNot() {
      this.$refs.audio.muted = !this.$refs.audio.muted;
      this.audio.muted = this.$refs.audio.muted;
    },
    // 音量条toolTip
    formatVolumeToolTip(index) {
      return "音量条: " + index;
    },
    // 进度条toolTip
    formatProcessToolTip(index = 0) {
      index = parseInt(this.audio.maxTime / 100 * index);
      return "进度条: " + realFormatSecond(index);
    },
    // 音量改变
    changeVolume(index = 0) {
      this.$refs.audio.volume = index / 100;
      this.volume = index;
    },
    // 播放跳转
    changeCurrentTime(index) {
      // console.log("index", index);
      this.$refs.audio.currentTime = parseInt(index / 100 * this.audio.maxTime);
    },
    mousedownChange(e) {
      this.pausePlay();
    },
    mouseupChange(e) {
      this.clickstatus ? this.startPlay() : null;
    },
    startPlayOrPause() {
      // console.log(this.audio.playing);
      this.clickstatus = !this.clickstatus;
      return this.audio.playing ? this.pausePlay() : this.startPlay();
    },
    // 开始播放
    startPlay() {
      this.$refs.audio.play();
    },
    // 暂停
    pausePlay() {
      this.$refs.audio.pause();
    },
    // 当音频暂停
    onPause() {
      this.audio.playing = false;
    },
    // 当发生错误, 就出现loading状态
    onError(e) {
      if(e.type === 'error'){
        this.errorFile = true;
        this.audio.waiting = false;
      }else if(e.type == 'waiting'){
        this.audio.waiting = true;
      }
    },
    // 当音频开始等待
    onWaiting(res) {
      console.log(res);
    },
    // 当音频开始播放
    onPlay(res) {
      this.audio.playing = true;
      this.audio.loading = false;
      if (!this.controlList.onlyOnePlaying) {
        return;
      }
      let target = res.target;
      let audios = document.getElementsByTagName("audio");
      [...audios].forEach(item => {
        if (item !== target) {
          item.pause();
        }
      });
    },
    // 当timeupdate事件大概每秒一次，用来更新音频流的当前播放时间
    onTimeupdate(res) {
      // console.log("res", res);
      this.audio.currentTime = res.target.currentTime;
      this.sliderTime = parseInt(
        this.audio.currentTime / this.audio.maxTime * 100
      );
    },
    // 当加载语音流元数据完成后，会触发该事件的回调函数
    // 语音元数据主要是语音的长度之类的数据
    onLoadedmetadata(res) {
      // console.log("loadedmetadata");
      // console.log(res);
      this.audio.waiting = false;
      this.errorFile = false;
      this.audio.maxTime = parseInt(res.target.duration);
    }
  },
  filters: {
    formatSecond(second = 0) {
      return realFormatSecond(second);
    },
    // transPlayPause(value) {
    //   return value ? "暂停" : "播放";
    // },
    // transMutedOrNot(value) {
    //   return value ? "放音" : "静音";
    // },
    transSpeed(value) {
      return "快进: x" + value;
    }
  },
  created() {
    this.setControlList();
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style type="text/scss" lang="scss" scoped>
.main-wrap {
  padding: 10px 15px;
  i.fa {
    font-size: 14px;
    margin-right: 0px;
    width: 14px;
    text-align: center;
  }
}

.slider {
  display: inline-block;
  width: 100px;
  position: relative;
  top: 14px;
  margin: 0 15px;
}
.di {
  display: inline-block;
}
.download {
  color: #409eff;
  margin-left: 15px;
}
.dn {
  display: none;
}
</style>
